YOU TO CAREFULLY DISPOSE OF IT. DO NOT RETURN IT, BUT DO CALL THE STORE FOR A FULL REFUND. WE'VE HEARD IT FROM OUR TEACHERS SINCE THE DAWN OF TIME. NO HORSE PLAY AT SCHOOL. BUT THE PITTSBURGH ZOO IS TURNING CONVENTIONAL WISDOM UPSIDEDOWN AND IS USING HORSE PLAY IN EDUCATING NEW ANIMALS AT THE ZOO AND PEOPLE THAT TRAIN THEM. THEY ALLOWED US TO ATTEND A SPECIAL CLASS TODAY. Reporter: YOU MIGHT CONSIDER THIS ZEBRA SPRING TRAINING FOR THE FOUR-LEGGED ANIMALS AND THEIR HANDLERS. WE HAVE THIS FOUR-FOOT CARROT STICK THAT ALLOWS US TO HAVE LONGER ARMS THAN GOD GAVE US. Reporter: THE ANIMALS AND THEIR HUMAN PARTNERS BOTH HAVE TO EARN THEIR STRIPES BEFORE THE ZEBRAS CAN MOVE INTO THE GIRAFFE YARD. WE ARE FIRST TAMING THEM DOWN TO PROVE TO THEM THAT WE REALLY DO CARE ABOUT THEM. WE REALLY DO LOVE WHAT THE ZEBRA HAS TO OFFER AND ALL ASPECTS OF WE NEED THEM TO BE TAMED. Reporter: PETER SAYS HE WANTS THE ANIMALS AND THEIR ZOO HANDLERS TO DEVELOP A TRUSTED BOND. WE DON'T WANT TO BE IN A SITUATION WHERE, YOU KNOW, WE ARE BEING DOMINANT OR TRYING TO MAKE THEM DO SOMETHING WITHOUT THEM UNDERSTANDING WHAT WE WANT THEM TO DO, SO WHAT WE WANT THEM TO DO IS BUILD A RELATIONSHIP, A PARTNERSHIP. Reporter: DR. BAKER SAYS THE ZOO IS TAKING A PROACTIVE APPROACH, EVOLUTIONIZING THE WAY THE ZOO TRAINS AND HANDLES ANIMALS. WE WANT TO BUILD THAT RELATIONSHIP BASED ON WHAT THE ANIMAL IS THINKING, HOW IS THE ANIMAL LOOKING AT THAT PROBLEM, AT THAT TRAILER, HOW IS THE ANIMAL LOOKING AT THAT GATE, AT THAT GIRAFFE, FOR EXAMPLE, WITH OUR ZEBRAS? Reporter: THE FIRST BIG LESSON, THESE ANIMALS CAN TRUST THEIR TRAINING, UNDERSTANDING THEY ARE NOT PREY ANIMALS IN THE WILD. WE GOT TO KEEP IN MIND US HUMANS CAN BE PERCEIVED AS PREDATORS, DEPENDING WHAT KIND OF BEHAVIORS WE EXHIBIT, SO WE REALLY HAVE TO LEARN HOW TO FEEL, ACT, THINK, AND PLAY LIKE